Six new phase diagrams, including a novel multicritical topology and two new ordered phases, are obtained by the global mean‐field theory of the spin‐1 Ising model with only nearest‐neighbor interactions, for negative biquadratic couplings. Renormalization‐group studies indicate a threshold spatial dimension, above and below which different sequences of phase diagrams occur.
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Consideration of global renormalization-group flows would then suggest that the point N is converted into a critical endpoint. Similarly, the point Vwould be converted to a bicritical point (unless a more complicated structure with the ferrimagnetic phase occurs).
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© 1991 American Institute of Physics.
1991
American Institute of Physics
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